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| 1 | +use anyhow::{anyhow, Context, Result}; |
| 2 | +use prost::Message; |
| 3 | +use prost_build::Config; |
| 4 | +use prost_types::FileDescriptorSet; |
| 5 | +use std::{ |
| 6 | + fs::{self, File}, |
| 7 | + io::{BufReader, Read, Write}, |
| 8 | + path::{Path, PathBuf}, |
| 9 | +}; |
| 10 | + |
| 11 | +use crate::svcgen::{AsyncMode, TtrpcServiceGenerator}; |
| 12 | + |
| 13 | +const FILE_DESCRIPTOR_SET: &str = "fd_set.bin"; |
| 14 | + |
| 15 | +pub struct Codegen<'a, P: AsRef<Path>> { |
| 16 | + out_dir: &'a P, |
| 17 | + protos: &'a [P], |
| 18 | + includes: &'a [P], |
| 19 | + /// Whether to enable serde |
| 20 | + serde: bool, |
| 21 | + async_mode: AsyncMode, |
| 22 | + /// Whether to generate service |
| 23 | + generate_service: bool, |
| 24 | +} |
| 25 | + |
| 26 | +impl<'a, P> Codegen<'a, P> |
| 27 | +where |
| 28 | + P: AsRef<Path>, |
| 29 | +{ |
| 30 | + pub fn generate(&self) -> Result<()> { |
| 31 | + self.compile_protos().context("Compile protos")?; |
| 32 | + self.write_header().context("Write header")?; |
| 33 | + self.clean_up().context("Clean up")?; |
| 34 | + |
| 35 | + Ok(()) |
| 36 | + } |
| 37 | + |
| 38 | + // TODO: Do not write header to the files that already has the header |
| 39 | + // TODO: Write header to the files generated by the codegen |
| 40 | + fn write_header(&self) -> Result<()> { |
| 41 | + // Read fd_set.bin |
| 42 | + let f = File::open(PathBuf::from(self.out_dir.as_ref()).join(FILE_DESCRIPTOR_SET)) |
| 43 | + .context("Open fd_set.bin")?; |
| 44 | + let mut reader = BufReader::new(f); |
| 45 | + let mut buffer = Vec::new(); |
| 46 | + reader.read_to_end(&mut buffer).context("Read fd_set.bin")?; |
| 47 | + |
| 48 | + let fd_set = FileDescriptorSet::decode(&buffer as &[u8]).context("Decode fd_set")?; |
| 49 | + |
| 50 | + for fd in fd_set.file.iter() { |
| 51 | + let rs_path = PathBuf::from(self.out_dir.as_ref()).join(format!("{}.rs", fd.package())); |
| 52 | + let mut f = match File::open(&rs_path) { |
| 53 | + Ok(f) => f, |
| 54 | + _ => continue, |
| 55 | + }; |
| 56 | + let header = format!( |
| 57 | + r#"// This file is generated by ttrpc-codegen {}. Do not edit |
| 58 | +// @generated |
| 59 | +
|
| 60 | +"#, |
| 61 | + env!("CARGO_PKG_VERSION") |
| 62 | + ); |
| 63 | + |
| 64 | + let mut buf = Vec::<u8>::new(); |
| 65 | + buf.write(header.as_bytes()).context("Write header")?; |
| 66 | + f.read_to_end(&mut buf) |
| 67 | + .context(format!("Read from rust file {:?}", rs_path))?; |
| 68 | + let mut f = File::create(&rs_path).context(format!("Open rust file {:?}", rs_path))?; |
| 69 | + f.write_all(buf.as_slice()) |
| 70 | + .context(format!("Write to rust file {:?}", rs_path))?; |
| 71 | + } |
| 72 | + |
| 73 | + Ok(()) |
| 74 | + } |
| 75 | + |
| 76 | + fn compile_protos(&self) -> Result<()> { |
| 77 | + let mut config = Config::new(); |
| 78 | + config.out_dir(self.out_dir.as_ref()); |
| 79 | + config.service_generator(Box::new(TtrpcServiceGenerator::new(self.async_mode))); |
| 80 | + config.protoc_arg("--experimental_allow_proto3_optional"); |
| 81 | + config.compile_well_known_types(); |
| 82 | + config.file_descriptor_set_path( |
| 83 | + PathBuf::from(self.out_dir.as_ref()).join(FILE_DESCRIPTOR_SET), |
| 84 | + ); |
| 85 | + if self.generate_service { |
| 86 | + config.include_file("_include.rs"); |
| 87 | + if self.serde { |
| 88 | + config |
| 89 | + .message_attribute(".", "#[derive(::serde::Serialize, ::serde::Deserialize)]"); |
| 90 | + } |
| 91 | + } |
| 92 | + config |
| 93 | + .compile_protos(self.protos, self.includes) |
| 94 | + .context("Compile protos by prost")?; |
| 95 | + Ok(()) |
| 96 | + } |
| 97 | + |
| 98 | + fn clean_up(&self) -> Result<()> { |
| 99 | + fs::remove_file(PathBuf::from(self.out_dir.as_ref()).join(FILE_DESCRIPTOR_SET)) |
| 100 | + .context("Remove fd_set.bin")?; |
| 101 | + Ok(()) |
| 102 | + } |
| 103 | +} |
| 104 | + |
| 105 | +#[derive(Default)] |
| 106 | +pub struct CodegenBuilder<'a, P: AsRef<Path> + Default> { |
| 107 | + out_dir: Option<&'a P>, |
| 108 | + protos: Option<&'a [P]>, |
| 109 | + includes: Option<&'a [P]>, |
| 110 | + /// Whether to enable serde |
| 111 | + serde: Option<bool>, |
| 112 | + async_mode: Option<AsyncMode>, |
| 113 | + /// Whether to generate service |
| 114 | + generate_service: Option<bool>, |
| 115 | +} |
| 116 | + |
| 117 | +impl<'a, P> CodegenBuilder<'a, P> |
| 118 | +where |
| 119 | + P: AsRef<Path> + Default, |
| 120 | +{ |
| 121 | + pub fn new() -> Self { |
| 122 | + Default::default() |
| 123 | + } |
| 124 | + |
| 125 | + pub fn set_out_dir(mut self, out_dir: &'a P) -> Self { |
| 126 | + self.out_dir = Some(out_dir); |
| 127 | + self |
| 128 | + } |
| 129 | + |
| 130 | + pub fn set_protos(mut self, protos: &'a [P]) -> Self { |
| 131 | + self.protos = Some(protos); |
| 132 | + self |
| 133 | + } |
| 134 | + |
| 135 | + pub fn set_includes(mut self, includes: &'a [P]) -> Self { |
| 136 | + self.includes = Some(includes); |
| 137 | + self |
| 138 | + } |
| 139 | + |
| 140 | + pub fn set_serde(mut self, serde: bool) -> Self { |
| 141 | + self.serde = Some(serde); |
| 142 | + self |
| 143 | + } |
| 144 | + |
| 145 | + pub fn set_async_mode(mut self, async_mode: AsyncMode) -> Self { |
| 146 | + self.async_mode = Some(async_mode); |
| 147 | + self |
| 148 | + } |
| 149 | + |
| 150 | + pub fn set_generate_service(mut self, generate_service: bool) -> Self { |
| 151 | + self.generate_service = Some(generate_service); |
| 152 | + self |
| 153 | + } |
| 154 | + |
| 155 | + pub fn build(&self) -> Result<Codegen<'a, P>> { |
| 156 | + let out_dir = match self.out_dir { |
| 157 | + Some(out_dir) => out_dir, |
| 158 | + None => return Err(anyhow!("The out dir is required.")), |
| 159 | + }; |
| 160 | + |
| 161 | + let protos = match self.protos { |
| 162 | + Some(protos) => protos, |
| 163 | + None => return Err(anyhow!("The protos are required.")), |
| 164 | + }; |
| 165 | + |
| 166 | + let includes = match self.includes { |
| 167 | + Some(includes) => includes, |
| 168 | + None => return Err(anyhow!("The includes are required.")), |
| 169 | + }; |
| 170 | + |
| 171 | + let serde = self.serde.unwrap_or(false); |
| 172 | + |
| 173 | + let async_mode = match self.async_mode { |
| 174 | + Some(mode) => mode, |
| 175 | + None => AsyncMode::None, |
| 176 | + }; |
| 177 | + |
| 178 | + let generate_service = self.generate_service.unwrap_or(false); |
| 179 | + |
| 180 | + Ok(Codegen { |
| 181 | + out_dir, |
| 182 | + protos, |
| 183 | + includes, |
| 184 | + serde, |
| 185 | + async_mode, |
| 186 | + generate_service, |
| 187 | + }) |
| 188 | + } |
| 189 | +} |
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